| # /* ************************************************************************** |
| # * * |
| # * (C) Copyright Edward Diener 2019. |
| # * Distributed under the Boost Software License, Version 1.0. (See |
| # * accompanying file LICENSE_1_0.txt or copy at |
| # * http://www.boost.org/LICENSE_1_0.txt) |
| # * * |
| # ************************************************************************** */ |
| # |
| # /* See http://www.boost.org for most recent version. */ |
| # |
| # ifndef BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP |
| # define BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP |
| # include <boost/preprocessor/variadic/has_opt.hpp> |
| # if BOOST_PP_VARIADIC_HAS_OPT() |
| # include <boost/preprocessor/control/iif.hpp> |
| # include <boost/preprocessor/facilities/check_empty.hpp> |
| # include <boost/preprocessor/tuple/rem.hpp> |
| # define BOOST_PP_VA_OPT_IMPL(atuple) \ |
| BOOST_PP_TUPLE_REM() atuple \ |
| /**/ |
| # define BOOST_PP_VA_OPT(rdata,rempty,...) \ |
| BOOST_PP_VA_OPT_IMPL \ |
| ( \ |
| BOOST_PP_IIF \ |
| ( \ |
| BOOST_PP_CHECK_EMPTY(__VA_ARGS__), \ |
| rempty, \ |
| rdata \ |
| ) \ |
| ) \ |
| /**/ |
| # endif /* BOOST_PP_VARIADIC_HAS_OPT() */ |
| # endif /* BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP */ |